/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package ru.miit.elearning.servlets.pages;

import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import ru.miit.elearning.hibernate.dao.ConfigurationDAO;
import ru.miit.elearning.hibernate.dao.CourseDAO;
import ru.miit.elearning.hibernate.dao.HibernateUtil;
import ru.miit.elearning.hibernate.dto.AdditionalProperty;
import ru.miit.elearning.hibernate.dto.CurriculumLevel;
import ru.miit.elearning.servlets.security.CourseNotFoundException;

/**
 *
 * @author Cyclone
 */
public class CourseProfileServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        boolean mayEdit = false;
        String message = null;

        Session session = null;

        try {

            int courseId = Integer.parseInt(request.getParameter("id"));

            session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();

            CourseDAO courseDAO = new CourseDAO(session);

            CurriculumLevel course = courseDAO.findCourse(courseId);
            if (course == null) {
                throw new CourseNotFoundException("Course id" + courseId + " not found");
            }

            List<CurriculumLevel> directionList = courseDAO.findAllDirections();
            
            int userId = courseDAO.findUserIdByLogin(request.getRemoteUser());

            mayEdit = request.isUserInRole("admin") || courseDAO.mayEdit(userId, courseId);

            if (mayEdit) {
                try {
                    ConfigurationDAO configurationDAO = new ConfigurationDAO(session);
                    List<AdditionalProperty> propertyList = configurationDAO.findCurriculumPropertiesByNoCurriculum(courseId);
                    request.setAttribute("propertyList", propertyList);
                } catch (Exception e) {
                    e.printStackTrace();
                    String propError = "Ошибка запроса списка доступных дополнительных свойств<br/>";
                    if (message != null) {
                        message += propError;
                    } else {
                        message = propError;
                    }
                }
            }

            

            request.setAttribute("message", message);
            request.setAttribute("mayEdit", mayEdit);
            request.setAttribute("directionList", directionList);

            request.setAttribute("course", course);
            getServletContext().getRequestDispatcher("/courseProfile.jsp").forward(request, response);
            session.getTransaction().commit();

        } catch (CourseNotFoundException e) {
            message = "Запрошенный курс не найден";
            e.printStackTrace();

            request.setAttribute("message", message);
            getServletContext().getRequestDispatcher("/courseProfile.jsp").forward(request, response);
            if (session != null && session.isOpen()) {
                session.getTransaction().rollback();
            }
        } catch (Exception e) {
            message = "Ошибка запроса описания курса";
            e.printStackTrace();

            request.setAttribute("message", message);
            getServletContext().getRequestDispatcher("/courseProfile.jsp").forward(request, response);
            if (session != null && session.isOpen()) {
                session.getTransaction().rollback();
            }

        } finally {
            if (session != null && session.isOpen()) {
                session.close();
            }
        }
    }
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
